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TROUBLESHOOTING
PROBLEM
No power/no mist from spout
Peculiar odor
Excessive noise
White dust accumulation
POSSIBLE CAUSE
• Unit is not plugged in
• Unit is not turned on
• No power at unit
• Low water level
• Transducer/ultrasonic
membrane needs cleaning
• Humidistat set lower than
the current room humidity
• Unit is new
• If unit is in use, the odor
may be a dirty tank or old
tank water
• Old water in water reservoir
• Unit is not level
• Low water level
• Hard water used
• Demineralization cartridge
needs to be replaced
13
SOLUTION
• Plug unit in
• Press the power button to
turn the unit on
• Check circuits and fuses or
try a different outlet
• Refill the tank with water
• Follow Cleaning the
Transducer/Ultrasonic
Membrane instructions
in the Cleaning and Care
section
• Reset the humidistat to a
higher humidity setting, or
change to continuous on
• Remove the tank cover and
let the tank air out in a cool,
dry place for 12 hours
• Empty the old water,
clean the tank, and fill
with clean water
• Remove the tank cover and
tank. Pour out any remaining
water in the water reservoir
• Place unit on a flat,
even surface
• Check the water level; refill
the tank if the water is low
• Use distilled water and a
demineralization cartridge
• Replace demineralization
cartridge
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Need help?
Do you have a question about the UHE-CMTF91 and is the answer not in the manual?
Questions and answers
How do I get an instruction manual and where can I get cartridges.
To obtain an instruction manual for the HoMedics UHE-CMTF91, visit www.homedics.com (for the USA) or www.homedics.ca (for Canada). To acquire cartridges or other accessories, you may also contact HoMedics customer service at 1-800-466-3342 (USA) or 1-888-225-7378 (Canada) during their operating hours.
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Will not work no buttons will work
The HoMedics UHE-CMTF91 may not be working and the buttons may not be responding due to the following possible causes:
1. Power Issue – The device may not be plugged in properly. Solution: Ensure the humidifier is connected to a working power outlet.
2. Power Supply Problem – There may be an issue with the circuit or fuse. Solution: Check the circuit breakers, fuses, or try a different outlet.
3. Low Water Level – The water level might be too low for the unit to function. Solution: Refill the water tank.
4. Dirty Transducer/Membrane – The ultrasonic transducer or membrane may require cleaning. Solution: Follow the cleaning instructions provided in the manual.
5. Incorrect Humidistat Setting – The humidistat may be set lower than the ambient humidity. Solution: Adjust the humidistat to a higher humidity level or set it to continuous mode.
6. Clogged Output Valve – The output valve may need cleaning. Solution: Follow the cleaning steps in the manual.
If the issue persists after checking these points, further troubleshooting may be needed.
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Hi. I have the CMT F91. Lights are on, plenty of water in tank but no mist comes out.
If your HoMedics UHE-CMTF91 humidifier is not producing mist despite having water and lights on, consider these possible reasons:
1. Empty or Incorrectly Seated Water Tank – Ensure the tank is filled with water and properly placed on the base.
2. Mineral Buildup – If the unit has been used without cleaning, mineral deposits may block the ultrasonic transducer. Clean the unit according to the manual.
3. Demineralization Cartridge Issue – If using a demineralization cartridge, check if it needs replacement, as an old or clogged cartridge can affect mist production.
4. Wrong Mist Level Setting – Ensure the mist level is not set too low.
5. Room Humidity Levels – If the room is already humid, the unit may produce less mist.
6. Blocked Mist Outlet – Check for any obstructions in the mist outlet.
7. Internal Malfunction – If none of the above solutions work, the unit may need professional servicing.
Try troubleshooting these issues to restore mist production.
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